Lubricator



(No Mode1.)\

F. B. SHAW.

LUBRIOATOR- No. 248,356 Patented Oct. 18,1881

UNITED STATES PATENT OFFICEC FREDERIC B. SHAW, OF BOSTON, MASSACHUSETTS.

LUBRICATOR.'

SPECIFICATION formingpart of-Letters Patent No. 248,356, dated October18, 1881.

Application filed October l1, 1880. (No model.)

1o all whom it may concern Be it known that I, FREDERIC B. SHAW, ofBoston, in thc county of Suffolk and State of Massachusetts, haveinvented a new and useful Improvement in Luhricators, of which thefollowing is aspecification.

The object oi' inyinvention is to produce an oil-cup or lubricator forjournals and bearings, whether movable orstationary, which shall besimple in-construction and free from all liability to injury by theadmission ol" dust or other deleterious substances. i

The invention consists in the combination, with the cup that holds thelubricating material, ol' a piston, which is fitted in the said cup soas to be oil-tight, and isy connected to a rod which is attached to theupper part of a cap that screws down over thc cup, and is turned withthc cap, so that by turning the cap in one direction the lubricatingsubstance will be forced downward and out through a passage in thenipple at the lower end of the cup, to supply the lubricating substanceor compound to the journals or shafts to which the cup is attached, asdesired.

Referring to the drawings, Figure 1 is an elevation of my invention, andFig. 2 a vertical section oi' the same.

The lubricatorlnay he made oi' any suitable metal, brass or compositionbeing preferred.

A is a cup, having at its lower end a nipple, G, which may be providedwith a screw-thread for attachment to a bearing orjournal, and has acentral opening for the passage ofthe lubrieating substance. On theupper outer end of the cup A is a screw-thread, a.

B is a cap or cover, provided with a screwthread on its inner surface,and extending the whole length of the same, as shown in Fig. 2. Withinthe cup A -is snugly fitted, so as to render it oil-tight, a. piston, C,attached to a rod or bar, D, the upper part of which, at E, is madesquare and fits in a corresponding hole in the top ofthe cap, and issecured in the same by aunt, l", screwed upon the upper end of the rodD,so that the piston can be readily removed and replaced when necessaryor desirable for cleaning, Ste.

The piston C may be provided with a paci;- ing in a groov`e on itsperimeter, il desirable. By turning the cap Bin one direction the pistonC will be' forced down andthe lubricating substance be expelled,.asrequired.

It will he seen that no part of the inside of the cup, the piston-rod,or the lubricating sub stance is liable to exposure to or the action ofdust, water, or vapor when in use, whether at sea or on land.

I am aware of the Patent No. 71,101, granted November 19, 1867, in whichis shown a solid plunger made part of the cover of the lubricator, andhaving a. cup passing up in a narrow space between the two. This I donot claim; but

What I do claim as my invention is A lubricator composed of the cap B,having an internal screw-thread, and provided with a detachable rod, D,carrying a piston, C, and a cup, A, having an internal smooth surfaceand an external screw-thread at its upper end, and provided with a screwnipple, G, and a. discharge-passage, all as shown and set forth.

1n testimony whereof'I have signed my naine to this specification in thepresence of two sub scribing witnesses.

FRED. B. SHAW. Witnesses:

J. H. Anims, F. H. MOORE.

